This the one you are talking about. Unfortunatley it has been marred by that big sign....
...it was a Taliesen Fellowship design, not sure if Wright had much of a hand in it (it was built in the early 1960s, I think). There is a story that the design was intended to mimic the modern ranch tract houses in the area, in terms of form and scale.
If true this would be ironic as one of the inlfuences on the modern ranch style was Wright.